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Re: Briggs & Stratton 6.5 hp Quantum
The problem that you are describing is caused by intake valve not seating correctly. I see this problem on engines that have many hours of use or lack of service. You may be able to grind /reseat /adjust valves but usually requires new guide, valve and spring. Enjoy
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Everybody had a crack at this problem, another thing would check is these engines sometimes have a primary fuel filter inside the tank itself. Drain the fuel and gently blow compressed air back through fuel line towards tank then rinse the tank out with fuel, refill and try run engine again
You should rebuild the carb if you can. Most likely the needle valve is getting stuck in the port. This can be caused by old gas left in the carb that evaporates and what is left is a yellowish sticky film that keeps the needle valve from sliding smoothly. If this is the case you will also find that yellow film on the bottom of the carb bowl also. Quick fix is to use Gumout carb cleaner. Spray in the carb wait a while and try to start it up. May take a while. once it starts keep spritzing Gumout in the carb little by little and see if this works. If not rebuild the carb. Hope this helps. Lastly before you put any of your equipment away that have gas, let them run out of gas first. Disconnect the supply line and let it run till it stops.
sounds like it's flooding . it could be a spark problem it could be that the carb needs to be rebuilt i would check for spark first you could also run a compression test on the engine . also keep in mind some times if your pump is clogged it will not let your engine start and will be hard to turn over .
Try soaking in white vinegar or any anti-water scale product. Misting requires a very small orifice and clogging is common. If you can back wash compressed air thru the holes, try that. A guitar string might be run thru the orifice and then back-flushed.
Is gas getting to the inlet of the carb, If it is the carb needs to be taken off of engine and dismantled. There is a plugged port in the carb its self. You need to clean it throughly, every little orifice. If you discover a white powder substance on metal surface inside carb ,that is caused by water damage. carb should be replaced at this point. If it's just green or rusty inside cleaning should work. You have to make shure you clean both the high and low mixture passages. if only the high gets claen when it runs it will hunt or surge because its not getting fuel though low mixture passage. good luck.